Patent RU-2376417-C2 (RU)
Inventor: KHRUSTALEV EVGENIJ NIKOLAEVICH
IPC: E02D1/00
Filed: 2007-01-11
Granted: 2009-12-20
Abstract: FIELD: construction, roads. 
     SUBSTANCE: invention relates to construction of motor ways and railroad embankments, erection of foundations and buildings and aerodrome pavements. Method of carrying capacity improvement provides for defining physical and mechanical characteristics of ground foundation or peat beds by the depth of compressed layer height H, angle φ of inner friction, c - specific cohesion, γ - bulk specific gravity, E 0  - common distortion module, embankment land filling to a design thickness h or foundation embedding to the depth h of foundation when setting to limits not exceeding permitted values S≤[S], where [S] -permitted setting of foundation at corresponding carrying capacity of foundation not exceeding permitted value R≥(p av -γh), where R -design foundation resistance to strength reduction, p av  - average pressure from load affecting die when required activities are performed to consolidate foundation. Based on reduced dependencies of ground and peat at maximum elastic setting of ground and peat foundations, carrying capacity of foundation in maximum elastic state phase for embankments and strip foundations are calculated. Maximum angle of elastic embankment or foundation semi-contact with ground is calculated for ground and peat by reduced dependencies for phase state corresponding to the "first critical" load. Carrying capacity of foundation is calculated for ground and peat based on reduced dependencies at corresponding setting of foundation and at angles of embankment semi-contact with foundation for ground or peat. Circular or strip foundation base in cross section and at ends is made so that to fit base with radius R c  to adapted to the above strip foundation in the proper phase state. Corresponding setting of foundations for embankment pads represented as square boxes in drawings are calculated based on reduced dependency at carrying capacity of foundation p sq , where p av  corresponds to p av  ≤   or p av  ≤  . Settings corresponding to phase states are calculated for bulk round pads with r radius based on reduced dependency at carrying capacity of foundation p r . Base for rigid rectangular foundations is made with convex cylindrical form with R c  radius and ends rounding radius R sq ≥R c , where v - width of cylinder contact with foundation base. In phase state, setting under cylindrical base of rigid foundation is defined as S a  and S orI  at corresponding value of base carrying capacity   and   and semi-contact angles Ψ=Ψ a  and Ψ=Ψ orI , at maximum elastic Herzen pressure under cylinder centre. In case of round and multi-sided foundation describing r radius, foundation base is made as convex sphere with R sph  for values corresponding to phase states of foundation Ψ=Ψ a  and Ψ=Ψ orI , p av =p r , s =   and s =  . Proper pits are excavated for rigid foundations in bases having corresponding radius of bottom deepening R b =R c =R sph . 
     EFFECT: increased accuracy of carrying capacity calculation and reliability of setting calculations and improved carrying capacity of ground and peat foundation bases. 
     2 cl, 1 ex, 15 dwg